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Allow 0==nbucket for DT_HASH, DT_GNU_HASH 

static linked 'Rust' program with no symbols
https://github.com/upx/upx/issues/476
This commit is contained in:
John Reiser 2021-03-25 07:22:01 -07:00 committed by Markus F.X.J. Oberhumer
parent b81ec224b7
commit 78f48d65d5
1 changed files with 6 additions and 2 deletions
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8
src/p_lx_elf.cpp
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@ -1673,6 +1673,8 @@ PackLinuxElf32::invert_pt_dynamic(Elf32_Dyn const *dynp, unsigned headway)
}
}
// DT_HASH often ends at DT_SYMTAB
// FIXME: sort DT_HASH, DT_GNU_HASH, STRTAB, SYMTAB, REL, RELA
// to partition the space.
unsigned const v_hsh = elf_unsigned_dynamic(Elf32_Dyn::DT_HASH);
if (v_hsh && file_image) {
hashtab = (unsigned const *)elf_find_dynamic(Elf32_Dyn::DT_HASH);
@ -1686,7 +1688,7 @@ PackLinuxElf32::invert_pt_dynamic(Elf32_Dyn const *dynp, unsigned headway)
unsigned const *const chains = &buckets[nbucket]; (void)chains;
unsigned const v_sym = !x_sym ? 0 : get_te32(&dynp0[-1+ x_sym].d_val);
if (!nbucket || (nbucket>>31) || !v_sym || (unsigned)file_size <= v_sym
if ((nbucket>>31) || !v_sym || (unsigned)file_size <= v_sym
|| ((v_hsh < v_sym) && (v_sym - v_hsh) < sizeof(*buckets)*(2+ nbucket))
) {
char msg[80]; snprintf(msg, sizeof(msg),
@ -5387,6 +5389,8 @@ PackLinuxElf64::invert_pt_dynamic(Elf64_Dyn const *dynp, upx_uint64_t headway)
}
}
// DT_HASH often ends at DT_SYMTAB
// FIXME: sort DT_HASH, DT_GNU_HASH, STRTAB, SYMTAB, REL, RELA
// to partition the space.
unsigned const v_hsh = elf_unsigned_dynamic(Elf64_Dyn::DT_HASH);
if (v_hsh && file_image) {
hashtab = (unsigned const *)elf_find_dynamic(Elf64_Dyn::DT_HASH);
@ -5400,7 +5404,7 @@ PackLinuxElf64::invert_pt_dynamic(Elf64_Dyn const *dynp, upx_uint64_t headway)
unsigned const *const chains = &buckets[nbucket]; (void)chains;
unsigned const v_sym = !x_sym ? 0 : get_te32(&dynp0[-1+ x_sym].d_val);
if (!nbucket || (nbucket>>31) || !v_sym || (unsigned)file_size <= v_sym
if ((nbucket>>31) || !v_sym || (unsigned)file_size <= v_sym
|| ((v_hsh < v_sym) && (v_sym - v_hsh) < sizeof(*buckets)*(2+ nbucket))
) {
char msg[80]; snprintf(msg, sizeof(msg),